Posted by **amanda** on Thursday, October 20, 2011 at 12:47am.

Take the mass of the Earth to be 5.98 ×

1024 kg.

If the Earth’s gravitational force causes a

falling 74 kg student to accelerate downward

at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall.

Answer in units of m/s2

- physics -
**drwls**, Thursday, October 20, 2011 at 6:34am
Since the forces on student (due to Earth) and Earth (due to student)are equal and opposite,

F = m g = M a

a = (m/M)* = 1.24*10^-23 g

= ??

- physics -
**lynn**, Wednesday, October 26, 2011 at 5:39pm
Two marbles, one twice as massive as the

other, are dropped from the same height.

When they strike the ground, how does the

kinetic energy of the more massive marble

compare to that of the other marble?

1. It has twice the KE.

2. It has 4 times the KE.

3. It has one-half the KE.

4. It has the same KE

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